package com.group3.admin.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet Filter implementation class AuthFilter
 * 所有写好的servlet都在这里匹配，所以写新的Servlet是要更新此处的配置
 */
//@WebFilter({"/LoginServlet", "/MListServlet", "/QueryAMServlet", "/ReviewServlet", "/BlockServlet"})
public class AuthFilter implements Filter {

    /**
     * Default constructor. 
     */
    public AuthFilter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		// place your code here
		System.out.println("new request comes");
		// coercion
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse resp = (HttpServletResponse) response;
		if (req.getSession().getAttribute("username").equals("admin")) { 
			chain.doFilter(request, response);
		} else {
			System.out.println("redirect to login.html");
			resp.sendRedirect("login.html");
		}
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}
